Abstract: An electrolyte solution includes an electrolyte salt, a solvent, and a polyether. A secondary battery includes the electrolyte solution. A method for preparing a secondary battery electrolyte solution includes adding an additive and a cyclic ether compound into a composition containing an electrolyte salt and a solvent, and performing in-situ polymerization for at least 24 hours to obtain the secondary battery electrolyte solution. The additive is a Lewis acid or a Lewis acid precursor.

Abstract: This application provides an electrolyte for a sodium secondary battery, a sodium secondary battery, and an electrical apparatus. An electrolyte for a sodium secondary battery is provided, where the electrolyte includes an additive, and the additive includes a fluorinated ether compound. In this application, through the addition of an additive, including a fluorinated ether compound, in the electrolyte, the high-temperature cycling performance of the battery can be improved, the high-temperature gas generation phenomenon of the battery can be alleviated, and the electrochemical performance and safety performance of the battery can be improved.

Abstract: This application provides an electrolyte for a sodium secondary battery, a sodium secondary battery, and an electric device. An electrolyte for a sodium secondary battery is provided, where the electrolyte includes an additive, and the additive includes a sulfate ester compound or a sulfonate ester compound. In this application, through the addition of an additive, including a sulfate ester compound or a sulfonate ester compound, in the electrolyte, the high-temperature cycling performance of the battery can be improved, the high-temperature gas generation phenomenon of the battery can be alleviated, and the electrochemical performance and safety performance of the battery can be improved.

Abstract: This application provides a sodium secondary battery electrolyte, a sodium secondary battery, and an electric apparatus. The sodium secondary battery electrolyte is provided, and the electrolyte includes a diluent, where the diluent includes alkane with a formula CnH2n+2, where n is 8 to 13. The diluent can improve high-temperature cycling performance of a battery, reduce high-temperature gas production of the battery, and enhance electrochemical performance and safety performance of the battery at high temperature.

Abstract: A sodium secondary battery includes a positive electrode plate, a negative electrode plate, a first electrolyte located on the side of the positive electrode plate, and a second electrolyte located on the side of the negative electrode plate, where the first electrolyte and the second electrolyte contain different organic solvents, the first electrolyte contains an ester solvent, a sulfone solvent, or a fluoroether solvent, and the second electrolyte contains an ether solvent or an amide solvent. With different organic solvents matched with the positive/negative electrode plate respectively, the electrochemical stability window width of the battery is optimized while gas generation and swelling of the battery are alleviated.

Abstract: A solid electrolyte, a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus are described. The solid electrolyte includes a compact layer and a porous layer located on at least one side of the compact layer, where a porosity of the porous layer is greater than a porosity of the compact layer. The porous layer helps to improve the wettability of an interface between the solid electrolyte and a positive electrode plate/negative electrode plate, and also facilitates filling of positive and negative electrode active substances into pores, thereby reducing interface resistance of a battery and improving rate performance and low-temperature performance of the battery.

Abstract: This application provides a sodium secondary battery electrolyte, a sodium secondary battery, and an electrical device. The sodium secondary battery electrolyte includes a solvent. A percentage of an amount of substance of a free solvent in relation to a total amount of substance of the solvent in the electrolyte is not greater than 50%.

Abstract: This application provides a current collector and a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus. The current collector includes a metal substrate and a surface treatment layer formed on at least one side of the metal substrate, where the surface treatment layer includes oxide and/or nitride of the metal substrate. The surface treatment layer can protect the metal from corrosion by anions in the electrolyte solution or optimize the metal nucleation behavior, improve the coulombic efficiency and cycle capacity retention rate of the battery, and improve the storage performance of the battery.

Abstract: A train positioning method based on a dynamic map includes: performing train positioning initialization based on a positioning source, and obtaining key point information for creating the dynamic map; generating key point coordinates according to the key point information, and creating the dynamic map; updating a train position on the dynamic map according to train displacement and beacon information; updating the dynamic map, and updating the train position based on the updated dynamic map; and, converting an updated train position in the updated dynamic map into a standard track map, to achieve train positioning. A plurality of initialized positioning sources are used to obtain initialization positioning information of train key points, and creation of a dynamic map is completed.

Abstract: Disclosed herein is a trailable vehicle comprising a body for defining an interior space of the trailable vehicle, the body having at least one side wall extending between a roof and base of the trailable vehicle; wherein at least part of one side wall is directly connected to the roof and substantially formed of metallic sheet material. Also disclosed is a method of manufacturing said trailable vehicle. Also disclosed herein is a trailable vehicle stabilising system for stabilising a trailable vehicle during travel, the system comprising at least one wing member being mountable to a body of the trailable vehicle wherein the wing member(s) are configured to generate a downward force on the trailable vehicle during travel.

Abstract: A hard carbon. A total quantity of adsorbed nitrogen under a relative pressure P/P0 of nitrogen between 10?8 and 0.035 is V1 cm3 (STP)/g and a total quantity of adsorbed nitrogen under a relative pressure P/Po of nitrogen between 0.035 and 1 is V2 cm3 (STP)/g in a nitrogen adsorption isotherm determined at a temperature of 77 K for the hard carbon. The hard carbon satisfies: V2/V1?0.20 and 20?V1?150, where P represents an actual pressure of nitrogen, and P0 represents a saturated vapor pressure of nitrogen at a temperature of 77 K.

Abstract: The present application provides a hard carbon, a method for preparing the same, a secondary battery comprising the same, and an electrical apparatus comprising the same, where an amount of generated CO2 is detected in thermal programmed desorption-mass spectrum (TPD-MS) to be less than or equal to 1.0 mmoL/g and an amount of generated CO is detected in thermal programmed desorption-mass spectrum to be less than or equal to 2.0 mmoL/g, when the hard carbon is heated from 50° C. to 1,050° C. The present application can improve both the capacity and the first coulomb efficiency of the hard carbon.

Abstract: A staged cementing device includes a cylindrical body having an inner chamber. A circulating opening and a liquid inlet recess open to the inner chamber are arranged on a wall of the body. An opening assembly is arranged in the body, which has an opening sleeve and an opening seat located in the opening sleeve. Initially the opening sleeve is connected with the body through a first shear pin and covers the circulating opening, and the opening seat is connected with the opening sleeve through a second shear pin and covers the liquid inlet recess. A packer includes a packing valve body and a packer rubber. The packing valve body includes a flow channel in communication with the liquid inlet recess, and the packer rubber includes a liquid reservoir in communication with the flow channel. The second shear pin is sheared off in response to primary cementing procedure.

Abstract: A plasma generation module includes a first electrode that includes a linear structure of a flexible material; a second electrode having a structure made of a flexible material and is disposed opposite to the first electrode. The first electrode and the second electrode are configured to form a linear discharge region between the first electrode and the second electrode. The plasma generation module includes a dielectric layer provided between the first electrode and the second electrode.

Abstract: This application relates to a secondary battery, a battery module, a battery pack, and an electric apparatus. The secondary battery includes: a negative electrode plate including a negative electrode current collector and a negative electrode film layer disposed on the negative electrode current collector, the negative electrode film layer containing a carbon material; a positive electrode plate including a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, the positive electrode active material layer containing a sodium-ion active material; and an electrolyte disposed between the negative electrode plate and the positive electrode plate, the electrolyte containing sodium salt and lithium salt.

Abstract: A hard carbon. A total quantity of adsorbed nitrogen under a relative pressure P/P0 of nitrogen between 10?8 and 0.035 is V1 cm3 (STP)/g and a total quantity of adsorbed nitrogen under a relative pressure P/Po of nitrogen between 0.035 and 1 is V2 cm3 (STP)/g in a nitrogen adsorption isotherm determined at a temperature of 77 K for the hard carbon. The hard carbon satisfies: V2/V1?0.20 and 20?V1?150, where P represents an actual pressure of nitrogen, and P0 represents a saturated vapor pressure of nitrogen at a temperature of 77 K.

Abstract: A staged cementing device includes a cylindrical body having an inner chamber. A circulating opening and a liquid inlet recess open to the inner chamber are arranged on a wall of the body. An opening assembly is arranged in the body, which has an opening sleeve and an opening seat located in the opening sleeve. Initially the opening sleeve is connected with the body through a first shear pin and covers the circulating opening, and the opening seat is connected with the opening sleeve through a second shear pin and covers the liquid inlet recess. A packer includes a packing valve body and a packer rubber. The packing valve body includes a flow channel in communication with the liquid inlet recess, and the packer rubber includes a liquid reservoir in communication with the flow channel. The second shear pin is sheared off in response to primary cementing procedure.

Abstract: A method of preparing a mesoporous Fe—Cu—SSZ-13 molecular sieve includes activating an aluminum source, a silicon source, an iron source and a copper source respectively; mixing the activated minerals with sodium hydroxide, water and a seed crystal at 25-90° C., while controlling feeding amounts of respective raw materials so that molar ratios of respective materials in a synthesis system are as follows: SiO2/Al2O3=10-100, SiO2/Fe2O3=30-3000, SiO2/CuO=1-100, Na2O/SiO2=0.1-0.5, H2O/SiO2=10-50, template/SiO2=0.01-0.5; adding an acid source to adjust pH of the system for first aging; and adding the acid source again to adjust the pH of the system for second aging to obtain aged gel; pouring an aged mixture into a kettle; cooling a crystallized product and filtering to remove a liquor; washing a filter cake; drying to obtain a solid; performing ion exchange; and filtering, washing and drying the solid to obtain powder; and placing the powder in a muffle furnace.

Abstract: A camera device and a mobile terminal are provided by the present disclosure. The camera device includes a lens module, a light-guiding tube and a photosensitive sensor; the light-guiding tube is arranged at a periphery of a light-entering hole of the lens module; the light-guiding tube is connected to the photosensitive sensor; and the photosensitive sensor is connected to a circuit board of the lens module.

Abstract: A method of preparing a mesoporous Fe—Cu—SSZ-13 molecular sieve includes activating an aluminum source, a silicon source, an iron source and a copper source respectively; mixing the activated minerals with sodium hydroxide, water and a seed crystal at 25-90° C., while controlling feeding amounts of respective raw materials so that molar ratios of respective materials in a synthesis system are as follows: SiO2/Al2O3=10-100, SiO2/Fe2O3=30-3000, SiO2/CuO=1-100, Na2O/SiO2=0.1-0.5, H2O/SiO2=10-50, template/SiO2=0.01-0.5; adding an acid source to adjust pH of the system for first aging; and adding the acid source again to adjust the pH of the system for second aging to obtain aged gel; pouring an aged mixture into a kettle; cooling a crystallized product and filtering to remove a liquor; washing a filter cake; drying to obtain a solid; performing ion exchange; and filtering, washing and drying the solid to obtain powder; and placing the powder in a muffle furnace.